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Just for reference since it's a fun topic. Anything in yellow is what Disney/Theme Park District considers suitable land to build on not marked as conservation. That can obviously change, but as of now this is the active plan.
1) This area had a significant change in the Reedy Creek development in 2023. This is likely the location of a new MK monorail resort along with prep for Villains/Cars. Doubt we see a park here.
2) Surprisingly suitable and arguably the best location for a new park. Can utilize the existing MK parking with (with accommodations/expansion obviously) and already has highway & monorail access.
3) Small, but a similar size to DHS. Parking will be needed elsewhere though.
4) Only likely if they build a parking structure to accommodate both parks. I see this area developing over time with more hotels when the time comes. A Toy Story Hotel here is just obvious.
5) Insiders on WDWMagic have considered this area as the best choice for a new theme park. If WWoS is replaced, you have a massive new resort area to utilize.
6) Likely saved for hotel expansion
Other than these locations, there is still quite a few areas around WDW owned property big enough to place a park, but their locations are far and inconvenient. Mainly near the Flamingo Crossings area which has a good chunk of land back there.